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Title: Toward a resolution of the proton size puzzle

We show that off-mass-shell effects arising from the internal structure of the proton provide a new proton polarization mechanism in the Lamb shift, proportional to the lepton mass to the fourth power. This effect is capable of resolving the current puzzle regarding the difference in the proton radius extracted from muonic compared with electronic hydrogen experiments. These off-mass-shell effects could be probed in several other experiments. A significant ambiguity appearing in dispersion relation evaluations of the proton polarizability contribution to the Lamb shift is noted.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Department of Physics, University of Washington, Seattle, Washington 98195-1560 (United States)
  2. CSSM, School of Physics and Chemistry, University of Adelaide, Adelaide, South Australia 5005 (Australia)
  3. Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)
Publication Date:
OSTI Identifier:
22068451
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 84; Journal Issue: 2; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DISPERSION RELATIONS; HYDROGEN; LAMB SHIFT; LEPTONS; MASS; POLARIZABILITY; PROTONS; RESOLUTION